Friend w



(No Model.)

P. W. SMITH,J1-. PIPE THREADING MACHINE.

No. 508,582; Patented'Nov. 14, 1893.

INVENTOR ASHE-c rrnn STATES-- PATENT OFFICE.

FRIEND W. SMITH, JR, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO CURTIS 82; CURTIS, OF SAME PLACE.

PlPE-THREADING MACHINE.

SPECIFICATION forming part of Letters Patent No; 508,582, dated November 14, 1893. Application filed February 27,1893. Serial No. 463,859. (No model.)

To all whom it may concern.-

Beit known that I, FRIEND W. SMITH, Jr., a cltlzen of the United States, residing at Brldgeport, in the county of Fair-field and State of Connecticut, have invented certain newand useful Improvements in Pi pe-Th reading Machines; and I do hereby declare the following to be a full, clear, and exact descrlption of the invention, such as will enable others skilled 1n the art to which it appertalns to make and use the same.

My lnvention relates to certain improvements 1n p1pe threading machines, and will be best understood from the following description, reference being had to the accompanylng drawings, in which- Figure 1 is an end view of myimproved machine; Fig. 2, a sectional elevation at the line 00, w, of Fig. 1; Fig. 3, a side elevation; Fig. 4, a detail elevation of the'die-head;Fig. 5, a detail front elevation of the die-plate; F g. 6, a detail side elevation of said plate; Fig. 7, a detail side elevation'showing the die head and plate assembled together, and Fig. 8, a sectional elevation similar toFigJ 2, but showing a slight modification of my improvements.

Similar numbers denotelike parts in the several figures of-the drawings.

1 is a bed-plate having rising therefrom a caslng 2 and journal bearings 3.

4 is a wheel having gear teeth on its periphery and provided with an axial shaft 5 extending from its rear side andjournaled in' the bearing 3. Extending through this wheel from front to rear are pins 6 preferably four in number, said pins being free to move back and forth and secured at their forward ends to a die-plate 7 which latter fits within a recess in the face of the wheelso as-to be flush with said face. This plate is superficially free from the wheel so as to be capable of an inward and outward movement. Projecting from the face of this plate are dovetailed ways 8 (see Figs. 5 and 6) and an arcuatc rib.

seen at 12, so as to fit snugly against the rib 9 and thereby insure the accurate centering of said head, as will be understood by reference'to Figs. 2, 4 and 5. casing is threaded, and the head 10 iscorrespondingly threaded, so that when said head revolves it will advance within the casing and leadthe threaded (lies on to the pipe. The

which a pin 14 is inserted from the bearing 3, whereby said shaft and the wheel 4 are prevented from moving lengthwise. During the advance of the head 10 within the casing, the

The interior of the shaft 5 has an annular groove 13 within pins 6 will insure harmony of rotation between the wheel and head. 15 is any ordinary pipe holding vise secured to the back of the casing, and 16 is a pinion in engagement with the teeth on the wheel whereby the latter may be revolved. In removing the diehead it is merely necessary to withdraw the pin 14 from the groove 13, and then slide the shaft5 and the Wheel carried thereby backward, and when the head is clear from the casing, said head may be readily withdrawn. 7 5

17 areopenings in the die-head, whereby the thread cut on the pipe may be inspected from time to time. The die-head may be made integralrwith the die-plate, as shown in Fig. 8, but insuch instance, no change at threading-dies can be made without first removing the pins 6 and then the wheel. v

I do not wish to limit my invention to the use of pins 6, as it is only necessary that the ing operationand having an axial shaft extended rearward therefrom and journaled within suitable bearings rising from the casing, and a diehead projecting from the face of the wheel and supported circumferentially ros within said casing, said die-head rigid with the casing as to rotary movement but capable die-plate should be rigid with the wheel as to 8 5 ring stationary as to sliding movement durin harmony therewith, the die-head detachably secured to said plate, and the casing Within which said head is supported circumferentially, substantially as shown and described.

In testimony whereof I aifix my signature in presence of two witnesses.

FRIEND \V. SMITH, JR.

Vitnesses:

HOWARD N. WAKEMAN, J S. FINCH. 

